diff --git a/src/game/script/routines_common.cpp b/src/game/script/routines_common.cpp
index a2c3f19e..15fcfd48 100644
--- a/src/game/script/routines_common.cpp
+++ b/src/game/script/routines_common.cpp
@@ -79,7 +79,14 @@ Variable Routines::stringToFloat(const VariablesList &args, ExecutionContext &ct
 }
 
 Variable Routines::stringToInt(const VariablesList &args, ExecutionContext &ctx) {
-    return Variable::ofInt(stoi(getString(args, 0)));
+    int result = 0;
+    string number(getString(args, 0));
+
+    if (!number.empty()) {
+        result = stoi(number);
+    }
+
+    return Variable::ofInt(result);
 }
 
 Variable Routines::turnsToSeconds(const VariablesList &args, ExecutionContext &ctx) {
diff --git a/src/game/script/routines_strings.cpp b/src/game/script/routines_strings.cpp
index 56727fed..be69ad9b 100644
--- a/src/game/script/routines_strings.cpp
+++ b/src/game/script/routines_strings.cpp
@@ -49,15 +49,27 @@ Variable Routines::getStringLowerCase(const VariablesList &args, ExecutionContex
 }
 
 Variable Routines::getStringRight(const VariablesList &args, ExecutionContext &ctx) {
+    string result;
     string str(getString(args, 0));
     int count = getInt(args, 1);
-    return Variable::ofString(str.substr(str.length() - count, count));
+
+    if (str.size() >= count) {
+        result = str.substr(str.length() - count, count);
+    }
+
+    return Variable::ofString(move(result));
 }
 
 Variable Routines::getStringLeft(const VariablesList &args, ExecutionContext &ctx) {
+    string result;
     string str(getString(args, 0));
     int count = getInt(args, 1);
-    return Variable::ofString(str.substr(0, count));
+
+    if (str.size() >= count) {
+        result = str.substr(0, count);
+    }
+
+    return Variable::ofString(move(result));
 }
 
 Variable Routines::insertString(const VariablesList &args, ExecutionContext &ctx) {